USB: cdc_acm: Fix race condition when opening tty
If acm_rx_tasklet() gets called before tty_port_block_til_ready() returns, then bulk IN urbs may not be sent. This fixes it. Signed-off-by: Henry Gebhardt <gebhardt@astro.uni-tuebingen.de> Acked-by: Oliver Neukum <oliver@neukum.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -609,9 +609,9 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
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acm->throttle = 0;
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tasklet_schedule(&acm->urb_task);
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set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
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rv = tty_port_block_til_ready(&acm->port, tty, filp);
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tasklet_schedule(&acm->urb_task);
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done:
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mutex_unlock(&acm->mutex);
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err_out:
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